The deportation rules, part of the administration’s efforts to tighten security, risk creating a vulnerable underclass, similar to residents in India’s slums, the guest workers in Persian Gulf states and migrant workers in China.

The discovery of seven Earth-sized planets revolving around a not-too-distant sun gives us earthlings our first realistic chance to search for signs of life outside our solar system.

And a “ring of fire” eclipse — when the moon moves between the sun and the Earth, but doesn’t completely block the sun — will be visible over parts of South America and the southern and western tips of Africa. (Elsewhere, you can watch it now on this live stream.)

After two straight years of #OscarsSoWhite, there are six black nominees and one of Asian heritage this year in the four acting categories. Our Race/Related newsletter takes a closer look, and includes a new short documentary that was a prize winner at the Sundance Film Festival.

The Democrats, who are at their lowest level of power in decades, elected a new party chairman in a narrow, contentious vote: Thomas Perez, the secretary of labor under President Barack Obama. The choice infuriated the party’s ascendant progressive wing, but it was mollified when its favored candidate, the Minnesota congressman Keith Ellison, was named deputy chairman (not elected, as we said earlier).

The party’s new strategy appears to mimic the Republican approach of the last eight years — the “party of no” — by waging daily resistance.

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CreditDoug Mills/The New York Times

5. President Trump received adulation at the Conservative Political Action Conference on Friday, where he took on familiar targets: the intelligence agencies and the press.

His new executive order on who will be allowed to enter the U.S. is expected as early as this week. Administration officials are playing down a finding by Homeland Security analysts: that the nation faces no increased risk of terrorism from travelers from the seven majority-Muslim nations barred from entry under an earlier executive order.

Mr. Trump will make his first address to a joint session of Congress on Tuesday. Democratic lawmakers are planning to give their guest tickets to immigrants who are making positive impacts on their communities, to rebut narratives that cast newcomers in a sinister light.

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CreditRonaldo Schemidt/Agence France-Presse — Getty Images

6. While Mr. Trump referred to his instructions to increase deportations of undocumented immigrants as “a military operation,” his homeland security secretary, John Kelly, said the opposite during a diplomatic trip to Mexico City.

Mr. Kelly’s visit, made alongside Secretary of State Rex Tillerson, was aimed at trying to improve the frayed ties between the U.S. and Mexico, who are closely linked trading partners. Besides the border wall and threats to deport Mexicans, Mexico is unhappy about the Trump administration’s plan to deport even non-Mexicans to Mexico.

7. There are also growing worries about the treatment of transgender people.

The transgender activist Caitlyn Jenner, a lifelong Republican and an early Trump supporter, blasted the administration’s decision to rescind protections for transgender students that allowed them to use bathrooms corresponding with their gender identity. In a sign of trouble within the administration, the education secretary, Betsy DeVos, initially refused to sign on to the order.

8. We may also learn more about Mr. Trump’s thinking about an overhaul of the federal tax code during his address to Congress on Tuesday. Tax returns (which are due on April 18 this year) will most likely not be affected.

Here are some pro tips to help you file your returns, and the lowdown on this year’s tax-preparation software.

9. The Department of Defense is expected to deliver its plan to defeat the Islamic State to the White House early this week.

Iraqi forces have seized most of Mosul’s airport, an important milestone in the broader offensive to retake the western half of the city from Islamic State fighters. Last month, the Iraqi government recovered the eastern part of Mosul from the militants.